柴油机配气机构动力学分析

发布时间：2018-04-21 19:46

本文选题：柴油机 + 配气机构　；参考：《大连理工大学》2011年硕士论文

【摘要】：作为内燃机重要组成部分的配气机构,其性能直接影响内燃机的动力性、经济性和耐久性。所以,当前内燃机研究的重要方向之一就是分析配气机构的动力学性能。随着人们对发动机的性能的要求不断提高,针对发动机的配气机构的动力学分析具有重要意义。本文以某型柴油机配气机构实体为模型,在Pro/Engineer中建立挺柱、推杆、摇臂、进、排气门、进、排气门座、进、排气门弹簧座、气门锁夹等实体模型,并进行组装。同时,计算这些零部件的质量、刚度、阻尼。然后,应用AVL-Excite Timing Drive软件,建立柴油机配气机构的动力学模型,并进行计算分析。根据所建立的配气机构的动力学模型,在发动机转速为1000rpm时,当进气门间隙分别为0.4mm和0.3mm时,对配气机构的进、排气门进行动力学计算,得出了进、排气门升程、速度、加速度、凸轮与挺柱间接触力、气门与气门座间接触力、弹簧中心质量位移等曲线,实现了配气机构的运动学和动力学分析。将得到的结果曲线与实验数据进行对比,发现升程曲线与设计的理论升程基本一致,各零部件的受力没有超过允许的范围,说明建立的这个模型是可行的。同时,对不同气门间隙的进气门结果曲线进行对比,发现较大气门间隙的进气门在气门开启和落座时的加速度和气门与气门座间接触力震荡较大,说明气门间隙的大小对于配气机构动力学特性有较大影响。
[Abstract]:As an important part of internal combustion engine, its performance directly affects the power, economy and durability of internal combustion engine. Therefore, one of the most important research directions of internal combustion engine is to analyze the dynamic performance of valve train. With the improvement of engine performance, it is of great significance to analyze the dynamics of engine valve train. In this paper, the solid models of tappet, push rod, rocker arm, intake, exhaust valve, intake and exhaust valve seat, inlet and exhaust valve spring seat, valve lock clamp and so on are established and assembled in Pro/Engineer. At the same time, calculate the mass, stiffness and damping of these parts. Then, using AVL-Excite Timing Drive software, the dynamic model of diesel engine valve train is established and analyzed. According to the established dynamic model of the valve distribution mechanism, when the engine speed is 1000rpm, when the intake valve clearance is 0.4mm and 0.3mm, the intake and exhaust valve of the valve valve are calculated dynamically, and the intake and exhaust valve lift and velocity are obtained. The kinematics and dynamics analysis of the valve distribution mechanism is realized by the curves of acceleration, contact force between cam and tappet, contact force between valve and valve seat, and mass displacement of spring center. By comparing the result curve with the experimental data, it is found that the lifting curve is basically consistent with the designed theoretical lift, and the force of each component does not exceed the allowable range, which shows that the model is feasible. At the same time, by comparing the result curves of intake valve with different valve clearance, it is found that the acceleration of inlet valve with larger valve clearance and the vibration of contact force between valve and valve seat are larger when the valve opens and sits. It shows that the size of valve clearance has great influence on the dynamic characteristics of valve distribution mechanism.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TK423;TH113

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